Any chance that Mega Darkrai and Mega Heatran will be viable for VGC?

I love both of these mons plus the Megas and I want to use them in VGC when they become available. But given their stat distributions, I just don't see it happening. I know some people can make it work like you see those top tier players making use of Mega Meowstic etc but I am not at that level. What do you guys think?